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  <a name="TPOPS_GaussDB_000814"></a><a name="TPOPS_GaussDB_000814"></a>
  <h1 class="topictitle1">When a Database Executes a Log Backup Job, an Error Is Reported Indicating That the Database Does Not Support the Paxos Protocol</h1>
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    <h4 class="sectiontitle">Symptom</h4>
    <p>When a database executes a log backup job, an error is reported indicating that the database does not support the Paxos protocol.</p>
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    <h4 class="sectiontitle">Possible Causes</h4>
    <p>If the database kernel version is earlier than 505.1.1 and the replica consistency protocol of the instance is Paxos, log backup fails.</p>
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    <h4 class="sectiontitle">Troubleshooting</h4>
    <ol>
     <li><span>Run the following command in the database of the instance to check the database kernel version:</span><p></p><pre class="screen">gaussdb -V</pre> <p>If the database kernel version is earlier than 505.1.1, perform subsequent operations.</p> <p></p></li>
     <li><span>Run the following command in the database of the instance to check the consistency protocol:</span><p></p><pre class="screen" id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_screen8129154810319">show enable_dcf</pre>
      <ul id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_ul1067119543325">
       <li id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_li367155483213">If <strong id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_b12629511111915">off</strong> is displayed in the command output, the replica consistency protocol of the backup copy is <strong id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_b15561420201920">Quorum</strong>.</li>
       <li id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_li203721361338">If <strong id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_b1248142114199">on</strong> is displayed in the command output, the replica consistency protocol of the backup copy is <strong id="TPOPS_GaussDB_000814__tpops_gaussdb_000812_b72482021181917">Paxos</strong>.</li>
      </ul> <p></p></li>
     <li><span>Select an instance whose replica consistency protocol is not Paxos to back up logs.</span></li>
    </ol>
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